Somewhere between cashing your first freelance check and realizing nobody withheld anything from it, the math stops feeling optional. Learning how to calculate freelance taxes isn't complicated — but it does require knowing which taxes you're actually dealing with before you start punching numbers.
Freelancers pay two separate obligations: self-employment tax, which replaces what employers used to split with you, and regular income tax, which everyone pays. Get either number wrong and you'll either underpay and face a penalty, or overpay and hand the government an interest-free loan until April. Neither is a great outcome.
This guide walks through the exact math, step by step, with real numbers at each stage. By the end you'll know what you owe, when you owe it, and how much to set aside from every payment so tax season stops being an event you dread.
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Why freelance taxes are different
When you have a regular job, your employer splits Social Security and Medicare contributions with you — 7.65% from your paycheck, 7.65% from theirs. As a freelancer, you pay both halves. That combined 15.3% is called self-employment tax, and it's the piece that catches most people off guard when they file for the first time.
You also lose automatic withholding. With a W-2 job, your employer quietly forwards money to the IRS every payroll cycle. Flying solo, that's your job now — which means sending estimated payments four times a year instead of getting one bill in April. Miss those payments and you'll owe a penalty even if you settle up in full by the filing deadline.
The good news: once you know the formula, the math is straightforward. It's the not-knowing that's expensive.
How to calculate freelance taxes in five steps
Step 1 — Calculate your net profit
Self-employment tax applies to your profit, not your revenue. That distinction matters more than it sounds.
Net profit = Total revenue − Business expenses
If you brought in $90,000 last year but spent $15,000 on equipment, software, a home office, travel to client meetings, and other legitimate deductions, your net profit is $75,000. That's the number you'll use for everything that follows.
The IRS has a fairly generous definition of deductible expenses — the business-use portion of your phone bill, professional subscriptions, health insurance premiums, and more. Keep receipts for everything. A few hundred dollars in ignored deductions can move you into a lower bracket or shave real money off your SE tax bill.
Step 2 — Calculate self-employment tax
The IRS doesn't apply SE tax to 100% of your net profit — it applies it to 92.35%, a small built-in adjustment that accounts for the employer-side deduction. Then it charges 15.3% on that figure.
One note: the 12.4% Social Security portion of that 15.3% only applies up to the annual wage base — roughly $168,600 in recent tax years. If your net profit is below that threshold (which covers most freelancers), the full 15.3% applies to the entire amount.
Step 3 — Deduct half of SE tax from your income
Here's a small break the IRS gives self-employed people: you can deduct half of your SE tax from your gross income before calculating income tax. This doesn't reduce your SE tax — it reduces your taxable income for income tax purposes.
Half of $10,597 = $5,299. That brings your adjusted gross income from $75,000 down to $69,701.
Step 4 — Calculate your income tax
From your adjusted gross income, subtract the standard deduction — $14,600 for single filers in 2024 (adjust for your actual filing year and situation). That leaves roughly $55,101 in taxable income.
Applying the 2024 federal tax brackets for a single filer:
- 10% on the first $11,600 = $1,160
- 12% on $11,601–$47,150 = $4,266
- 22% on the remaining $7,951 = $1,749
Total federal income tax: roughly $7,175. If you're married filing jointly, contributing to a retirement account, or claiming additional deductions, your taxable income goes down — and so does your bill.
Step 5 — Figure out what to set aside
Adding it all up for our $75,000 freelancer: $10,597 in SE tax + $7,175 in income tax = roughly $17,772 in combined federal taxes. That's an effective rate of about 23.7% on gross revenue.
The practical rule: set aside 25–30% of every payment you receive, in a separate savings account, the moment it lands. If you live in a state with income tax, add another 3–10% on top of that. This guide covers federal only — state taxes vary widely and are their own calculation.
The 25–30% range feels steep when you first start. It feels like genius-level planning every April.
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When and how to pay
The IRS doesn't wait until April. If you expect to owe more than $1,000 in taxes for the year, you're required to make four estimated quarterly payments:
- April 15 — covers January through March income
- June 15 — covers April and May income
- September 15 — covers June through August income
- January 15 (following year) — covers September through December income
You pay through IRS Direct Pay (free, no account required) or EFTPS. Each payment is roughly one-quarter of your estimated annual tax bill.
If your income varies month to month — which describes most freelancers — recalculate at each deadline based on what you've actually earned year-to-date. Overpaying a quarter isn't a problem; you'll get it back. Consistently underpaying across the year is where the penalty kicks in.
Tools that make tax tracking easier
Tracking income and expenses in a spreadsheet works fine when you have two or three clients. Once volume picks up, "I'll sort it out later" has a way of becoming a tax-season ordeal. Tools like FreshBooks and QuickBooks automate expense categorization, keep your profit number current all year, and generate quarterly estimates so you're not doing the math from scratch every three months.
Frequently asked questions
What is the self-employment tax rate?
15.3% — 12.4% for Social Security and 2.9% for Medicare — applied to 92.35% of your net profit. If your net profit exceeds the annual Social Security wage base (roughly $168,600 in recent years), the Social Security portion drops off above that threshold and you only pay the 2.9% Medicare rate on the excess.
Do I owe self-employment tax if I only made a small amount?
Yes, if your net self-employment income is $400 or more for the year. Below that threshold you're off the hook for SE tax — though you may still owe regular income tax depending on your total income from all sources.
Can I deduct health insurance premiums as a freelancer?
Yes. Self-employed individuals can deduct 100% of health insurance premiums paid for themselves, a spouse, and dependents. This reduces your adjusted gross income — not just taxable income — which lowers your income tax bill. It does not reduce your self-employment tax.
What happens if I miss a quarterly estimated payment?
The IRS charges an underpayment penalty, even if you pay your full bill by April 15. The penalty is calculated on the amount you were short and the number of days late — not a huge hit, but an entirely avoidable one. If your income is lumpy, paying based on actual year-to-date earnings each quarter reduces the risk.
How can I lower my self-employment tax?
Contribute to a SEP-IRA or Solo 401(k). These contributions reduce your net profit — the number SE tax is calculated from — which lowers both your self-employment tax and your income tax at the same time. A SEP-IRA allows contributions of up to 25% of net self-employment income, up to the annual IRS limit.